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The sender needs to match the gauge you are using. If it is an original gauge it needs an original sender to work best (however some users claim to get a resistance sender to work). A modern gauge needs a sender that matches the resistance range of the gauge.
Interesting article on installing a modern sender (and gauge) in a 32 tank.
http://www.hotrodhotline.com/install...r#.V2p8lY-cGUk